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Updated: Nov 3, 2025

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Published on: July 3, 2015
Controllable magnetization precession dynamics and damping anisotropy in Co2FeAl Heusler-alloy films
Yu Zhang1, Guanjie Wu, Weihua Zhu
1Shanghai Ultra-Precision Optical Manufacturing Engineering Research Center and Key Laboratory of Micro and Nano Photonic Structures (MOE), School of Information Science and Technology, Fudan University, Shanghai 200433, China. zzzhang@fudan.edu.cn.
Abstract:
Magnetization dynamics of the epitaxially-grown Co2FeAl (CFA) thin films have been systematically investigated by the time-resolved magneto-optical Kerr effect (TR-MOKE). The dependences of precession frequency f, relaxation time τ and magnetic damping factor α upon the orientation of applied magnetic field are found to have a strong four-fold symmetry. Two series of samples with various substrate temperatures (Ts) and thickness (tCFA) were prepared and a large Gilbert damping difference between the hard and easy axes is extracted to be 3.3 × 10-3 after subtracting the extrinsic contributions of spin pumping, two-magnon scattering and magnetic inhomogeneities. The four-fold variation of Gilbert damping relates closely to the in-plane magnetocrystalline anisotropy and can be attributed to the anisotropic distribution of spin-orbit coupling. Our findings provide new insights into the anisotropic properties of magnetization and damping, which is very helpful for designing and optimizing advanced spintronic devices on different demands.
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